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using System;
namespace Org.BouncyCastle.Asn1.Cms
{
public class EncryptedData
: Asn1Encodable
{
private readonly DerInteger version;
private readonly EncryptedContentInfo encryptedContentInfo;
private readonly Asn1Set unprotectedAttrs;
public static EncryptedData GetInstance(
object obj)
{
if (obj is EncryptedData)
return (EncryptedData) obj;
if (obj is Asn1Sequence)
return new EncryptedData((Asn1Sequence) obj);
throw new ArgumentException("Invalid EncryptedData: " + obj.GetType().Name);
}
public EncryptedData(
EncryptedContentInfo encInfo)
: this(encInfo, null)
{
}
public EncryptedData(
EncryptedContentInfo encInfo,
Asn1Set unprotectedAttrs)
{
if (encInfo == null)
throw new ArgumentNullException("encInfo");
this.version = new DerInteger((unprotectedAttrs == null) ? 0 : 2);
this.encryptedContentInfo = encInfo;
this.unprotectedAttrs = unprotectedAttrs;
}
private EncryptedData(
Asn1Sequence seq)
{
if (seq == null)
throw new ArgumentNullException("seq");
if (seq.Count < 2 || seq.Count > 3)
throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");
this.version = DerInteger.GetInstance(seq[0]);
this.encryptedContentInfo = EncryptedContentInfo.GetInstance(seq[1]);
if (seq.Count > 2)
{
this.unprotectedAttrs = Asn1Set.GetInstance(seq[2]);
}
}
public virtual DerInteger Version
{
get { return version; }
}
public virtual EncryptedContentInfo EncryptedContentInfo
{
get { return encryptedContentInfo; }
}
public virtual Asn1Set UnprotectedAttrs
{
get { return unprotectedAttrs; }
}
/**
* <pre>
* EncryptedData ::= SEQUENCE {
* version CMSVersion,
* encryptedContentInfo EncryptedContentInfo,
* unprotectedAttrs [1] IMPLICIT UnprotectedAttributes OPTIONAL }
* </pre>
* @return a basic ASN.1 object representation.
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(version, encryptedContentInfo);
if (unprotectedAttrs != null)
{
v.Add(new BerTaggedObject(false, 1, unprotectedAttrs));
}
return new BerSequence(v);
}
}
}
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